This episode gave me Cold Case vibes, but figuring out the killer was way too easy. 

Just found out the winner died last year  around June, 2022

@metsfan25 wrote:
Lewis and Munch investigate the murder of a biker; Meanwhile, Pembleton is drawn into a cover-up involving Congressman Jeremy Wade. Wade claims that he was kidnapped by his aide, but Pembleton discovers that Wade is gay.Harris tells Pembleton to drop the charges. The press picks up on the deal and the Department, not wanting to appear to play favors to politicians, is pressed to go to trial to save face. Harris denies that Pembleton dropped the charges on his orders, so Pembleton turns in his badge to Giardello. Bayliss begs Pembleton to return to Homicide, but Pembleton says he is through with the force. Meanwhile, Beau hires a private investigator to find Beth and the kids.

Why do you copy the episode description and repost them as your comment?   Ummmm

Disappointing way to end things but clearly they weren't expecting to get cancelled to put that out as the Final episode.

Pretty sure they intended that to be a Season finale then got the news.